wnck-applet crashed with SIGSEGV in g_closure_invoke()

[kikl]

Binary package hint: gnome-panel

I tried to edit the number of workplaces. Therefore, I right-clicked on the workspace-applet. Then, the applet crashed.

ProblemType: Crash
Architecture: i386
Date: Sat Mar 20 07:11:21 2010
DistroRelease: Ubuntu 10.04
ExecutablePath: /usr/lib/gnome-panel/wnck-applet
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Beta i386 (20100318)
Package: gnome-panel 1:2.29.92.1-0ubuntu1
ProcCmdline: /usr/lib/gnome-panel/wnck-applet --oaf-activate-iid=OAFIID:GNOME_Wncklet_Factory --oaf-ior-fd=18
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-16.25-generic
SegvAnalysis:
 Segfault happened at: 0x804c706: mov (%ebx),%eax
 PC (0x0804c706) ok
 source "(%ebx)" (0x00000000) not located in a known VMA region (needed readable region)!
 destination "%eax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gnome-panel
StacktraceTop:
 ?? ()
 ?? ()
 ?? () from /usr/lib/libbonoboui-2.so.0
 g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
 bonobo_closure_invoke_va_list ()
Title: wnck-applet crashed with SIGSEGV in g_closure_invoke()
Uname: Linux 2.6.32-16-generic i686
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Apport retracing service (apport)]

StacktraceTop:
 wncklet_connect_while_alive (object=0x0,
 display_properties_dialog (uic=0x89c5e30, pager=0x8a1bc00,
 bonobo_ui_component_add_verb_list (component=0x8a07280,
 g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
 bonobo_closure_invoke_va_list (closure=0x8a07280,